If the return value is “ 0 ”, it means the transfer was successful. “ 1 ” indicates that the data is too long to fit in the transfer buffer. The return value of the Wire.endTransmission() function can be useful, for example, when debugging. these values can be: If the parameter is false , Wire.endTransmission() sends a restart message after the transmission, so the I2C bus remains busy. This allows the current master device to send additional messages and prevents another master from taking over the I2C bus. Wire.If the parameter is true , Wire.endTransmission() sends a stop message after the transmission, releasing the I2C bus. Wire.endTransmission(true) //true=send stopĪrduino addresses are 7 bit (excluding RW bit), so I2C byte address 0x40 needs to be changed to 0x20 for arduino functions.Ĭlock Speed tClock(100000) //100000 = standard mode 0=success, 1=tx buff overrun, 2=NACK on address tx, 3=NACK on data tx, 4=other error If (Wire.endTransmission(false) = 0) //false=send restart (IMPORTANT-THIS ENDTRANSMISSION DOES NOT SEND STOP!). No need to send stop as done automatically Uint8_t BytesReceived = Wire.available() //The slave can send less than was requested Wire.requestFrom(0x5a, 2) //Address, no of bytes Result: 0=success, 1=tx buff overrun, 2=NACK on address tx, 3=NACK on data tx, 4=other error Uint8_t Result = Wire.endTransmission(true) //true=send stop Seems to be 7 bit value with bit0=lower bit (not I2C RW bit), so left shifted by 1 when sent over the wire.
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